8 blinks
Easy Fix
Trane · HVAC Systems (AC, Furnaces & Heat Pumps)
Low Flame Current
Quick Answer
Error code 8 blinks on your Trane HVAC Systems (AC, Furnaces & Heat Pumps) means: Low Flame Current. This is usually fixable — see the step-by-step guide below.
Likely Causes
How to Fix It
1
Remove the flame sensor and clean it with fine-grit emery cloth or light abrasive pad
2
Measure flame current using a microamp DC clamp meter (should read above 1.5 microamps)
3
Verify the furnace is properly grounded to the electrical panel
4
Check gas pressure at the manifold and adjust if out of specification
5
Inspect the flame sensor mounting gasket and replace if deteriorated
Pro Tip
This is a common issue that most users can resolve without specialized tools. Try the first step before moving on to more complex solutions.
Parts You May Need
Flame sensor
Emery cloth or abrasive pad
Flame sensor gasket
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